Spectacle Temple Snap-Fit Joint for Tool-Free Interchangeability
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Solution Overview
Problem
The screw-based joint in spectacles temples often becomes loose, making temple interchangeability difficult and requiring professional assistance, especially when trying to change temples without a specialist.
Innovation Solution
A screwless joint design featuring a transversely arranged pin in a longitudinal slot of the temple that snaps into an elastically deformable recess on a male part, allowing for easy rotation and stable positioning without tools, enabling infinite temple interchangeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screw-based joint is used to connect the temple to the frame, then the connection can be securely fastened, but the screw becomes loose over time and requires retightening or professional assistance for temple replacement
Solution Approach 1:
The invention extracts the screw from the joint mechanism entirely, replacing it with a snap-fit connection using a pin that engages with an elastically deformable recess. This eliminates the problematic element (screw) while maintaining secure connection and enabling easy user replacement of temples.
Solution Approach 2:
The snap-fit joint design allows the temple to be easily attached and detached by the user without requiring professional assistance or special tools. The elastic deformation of the recess enables the pin to snap into place during assembly and release during disassembly, making the system self-servicing.
2Strength
If a screw-based joint is used, then the temple can be firmly attached, but the user cannot easily replace the temple without visiting a specialist
Solution Approach 1:
The invention replaces the mechanical screw-threaded connection system with a snap-fit elastic deformation system. The pin engages with the elastically deformable recess, providing firm attachment through elastic force rather than threaded mechanical engagement, enabling easy user replacement.
3Device complexity
If traditional screw joints are used, then the structure is simple, but intermediate parts and tools are required for assembly and disassembly
Solution Approach 1:
The invention merges the pin and the recess into an integrated snap-fit system where the pin is directly formed on the temple and the recess is formed in the male part of the joint. This eliminates the need for separate screws, washers, and other intermediate parts, achieving tool-free assembly while maintaining structural integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design eliminates loose screws, allows for tool-free temple replacement, reduces production costs, and enables customizable color and shape combinations, ensuring secure and interchangeable temple connections.
Implementation Method 1
un elastically deformable recess (8, 8A) formed in a plate (9, 9A) projecting from the male part (4)
Data Source
AI summary
Spectacles consist of an optical or sunshade front optionally supported by a frame and comprising two interchangeable temples. Each temple is connected to the front or to the frame by a male part and an associated joint. In the spectacles, the joint of each temple consists of at least one pin arranged transversely in a corresponding longitudinal slot formed at one end of a free temple. The pin can be snapped into an elastically deformable recess formed in a plate projecting from the male part, the shape and dimensions of which are approximately the same as those of the slot of the temple, or vice versa.